US4090837A - Machine for molding materials with a long solidification time, such as structural foams - Google Patents
Machine for molding materials with a long solidification time, such as structural foams Download PDFInfo
- Publication number
- US4090837A US4090837A US05/760,503 US76050377A US4090837A US 4090837 A US4090837 A US 4090837A US 76050377 A US76050377 A US 76050377A US 4090837 A US4090837 A US 4090837A
- Authority
- US
- United States
- Prior art keywords
- plate
- stationary
- movable
- base
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007711 solidification Methods 0.000 title claims abstract description 5
- 230000008023 solidification Effects 0.000 title claims abstract description 5
- 239000004616 structural foam Substances 0.000 title description 3
- 239000012778 molding material Substances 0.000 title description 2
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000001746 injection moulding Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/428—Mould constructions; Mould supporting equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/12—Injection moulding apparatus using two or more fixed moulds, e.g. in tandem
Definitions
- This invention relates to a two-station machine for molding materials with a long solidification, such as structural foams.
- the drawback of the linear-type machines is the necessity for each station to be provided with a clamping device, which is one of the most heavy and complex units of the machine.
- the rotary-type machines comprise a complex and heavy unit, also, i.e. a rotating dividing table and, in addition, they are not adapted for molding large-sized parts.
- a basic drawback of all molding machines for the processing of slowly solidifying materials is that the whole machine is standing idle until the material injected into the mold cools and solidifyies. This drawback is particularly striking in the production of structural foam parts, which are usually thick-walled. Their heat-conductivity is impaired because of their cellular core structure and the heat-retaining gas inside the cells, the mold having to remain closed until the formation of a compact skin of sufficient rigidity to allow the part to be removed without a deformation thereof.
- this object is achieved in a molding machine in which a feed screw barrel is connected through a feeding conduit to two injection cylinders -- one for each injection mold, and the whole feeding unit is disposed between two fixed plates, to which the fixed mold halves are guided by and which are guided by the body of the machine, while the locking mechanism is disposed between one of the movable plates and a supporting plate, which by means of rods is rigidly fastened to the other movable plate and together with it is movably guided along the base of the machine.
- FIG. 1 is a side view of the injection molding machine with parts broken away;
- FIG. 2 is a top view of the injection molding machine shown in FIG. 1.
- the machine comprises a base 9 to which are attached the fixed plates 5,5' to which, in turn, to which there are fastened one their one side, the fixed mold halves 6,6' and between them there are disposed the injection cylinders 3,3' into which material is delivered from the feed screw barrel 16 through a nozzle 2, a feeding conduit 4 and distributor 17.
- One movable plate 11 and another movable middle plate 14 carry the movable mold halves 1',1 as well as the knockout cylinders 7.
- an adjustable slide 15 which forms part of a locking mechanism.
- Supporting plate 12 carries a hydraulically activated wedge-type locking mechanism 18 and is connected by means of rods 13 to the movable plate 11.
- the injection cylinders 3, 3' can be kept constantly charged with the moldable material by the feed screw barrel 16.
- both molds Prior to the injection of the material into one of the molds 20, 20', both molds are drawn closed by their respective hydraulic cylinders 10, 10' and then locked in their closed position by the locking mechanism 18 which comprises a plate 21 movable in the direction of arrow A by hydraulic means not shown, the locking mechanism 18 further comprising a wedge member 22 mounted on plate 21 and engageable with another wedge member 23 mounted on slide 15, which is guided in sleeve 15' for camming the slide 15 into engagement with a boss 19 mounted on plate 14.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
An injection molding machine in which a support on a base carries oppositely facing stationary mold portions which, when joined by movable mold portions, form a pair of mold cavities, one of which can be injected with a moldable material having a long solidification time, while the other contains a previously injected article which is solidifying and can be released as soon as the injection of the first cavity is completed. One of the movable mold portions is connected to a movable plate in a fixed spaced relationship, with a wedge-type locking mechanism between the plate and the other movable mold portion for the locking of both mold cavities simultaneously with a single locking mechanism.
Description
This invention relates to a two-station machine for molding materials with a long solidification, such as structural foams.
There are known in the art multi-station time molding machine the linear or rotary type, in which one plasticating screw barrel feeds two or more injection molds.
The drawback of the linear-type machines is the necessity for each station to be provided with a clamping device, which is one of the most heavy and complex units of the machine. The rotary-type machines comprise a complex and heavy unit, also, i.e. a rotating dividing table and, in addition, they are not adapted for molding large-sized parts.
There are further known two-station machines with one screw barrel and clamping unit, but they have the substantial drawback, in that the screw barrel is movable and follows the motion of the opening mold halves, while the individual opening of the molds requires a hydraulic device, which operates with a complex hydraulic system comprising several pressure steps.
A basic drawback of all molding machines for the processing of slowly solidifying materials is that the whole machine is standing idle until the material injected into the mold cools and solidifyies. This drawback is particularly striking in the production of structural foam parts, which are usually thick-walled. Their heat-conductivity is impaired because of their cellular core structure and the heat-retaining gas inside the cells, the mold having to remain closed until the formation of a compact skin of sufficient rigidity to allow the part to be removed without a deformation thereof.
It is therefore a general object of the present invention to avoid the aforementioned drawbacks of the known molding machines by providing a compact two-station molding machine in which one clamping mechanism locks simultaneously both injection molds during the time of the filling of one of them, unlocking during the remaining time, allowing the injection molds to be opened closed or, respectively, only one of them remaining closed for the time necessary for the solidification of the molded part, and to remain closed only under the action of the light and simple mechanism for opening and closing the injection molds.
In accordance with the invention, this object is achieved in a molding machine in which a feed screw barrel is connected through a feeding conduit to two injection cylinders -- one for each injection mold, and the whole feeding unit is disposed between two fixed plates, to which the fixed mold halves are guided by and which are guided by the body of the machine, while the locking mechanism is disposed between one of the movable plates and a supporting plate, which by means of rods is rigidly fastened to the other movable plate and together with it is movably guided along the base of the machine.
For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be made to the accompanying drawing in which there is illustrated and described a preferred embodiment of the invention, in which:
FIG. 1 is a side view of the injection molding machine with parts broken away; and
FIG. 2 is a top view of the injection molding machine shown in FIG. 1.
Referring to the drawing, the machine comprises a base 9 to which are attached the fixed plates 5,5' to which, in turn, to which there are fastened one their one side, the fixed mold halves 6,6' and between them there are disposed the injection cylinders 3,3' into which material is delivered from the feed screw barrel 16 through a nozzle 2, a feeding conduit 4 and distributor 17. One movable plate 11 and another movable middle plate 14 carry the movable mold halves 1',1 as well as the knockout cylinders 7. To the middle movable plate 14 there is fastened an adjustable slide 15, which forms part of a locking mechanism. Supporting plate 12 carries a hydraulically activated wedge-type locking mechanism 18 and is connected by means of rods 13 to the movable plate 11. The motion of the movable middle plate 14, as well as the movable plate 11 and the supporting plate 12, connected by means of rods 13, is effected over the guideways 8 of base 9 by means of displacement cylinders 10, 10' and casters 11', 12' and 14' which ride in the guideways 8.
In operation, the injection cylinders 3, 3' can be kept constantly charged with the moldable material by the feed screw barrel 16. Prior to the injection of the material into one of the molds 20, 20', both molds are drawn closed by their respective hydraulic cylinders 10, 10' and then locked in their closed position by the locking mechanism 18 which comprises a plate 21 movable in the direction of arrow A by hydraulic means not shown, the locking mechanism 18 further comprising a wedge member 22 mounted on plate 21 and engageable with another wedge member 23 mounted on slide 15, which is guided in sleeve 15' for camming the slide 15 into engagement with a boss 19 mounted on plate 14. In this position of the locking mechanism, pressure is brought to bear on plates 12 and 14, biasing them in opposite directions, the effect being that plate 14 locks mold 20, and plate 11, which is connected to plate 12 by rods 13 in a fixed spaced-apart relationship, locks mold 20' in a closed position.
With both molds in the locked condition, the one that is empty can be injected with the moldable material. At this point the locking mechanism 18 is released, so that the only force holding the molds closed comes from the injection cylinders 10, 10', allowing the mold 20 or 20', depending upon which one had been previously injected, to be opened independently to remove the molded article which had been hardening during the injection of the other mold.
Claims (5)
1. An injection molding machine for materials having a long solidification time, comprising:
a base;
support means on said base;
a first stationary mold portion on said support means;
a first plate movable on said base;
a first movable mold portion on said first plate and forming with said first stationary mold portion a first mold cavity in a closed position thereof;
a second stationary mold portion on said support means;
a second plate movable on said base;
a second movable mold portion on said second plate and forming with said second stationary mold portion a second mold cavity in a closed position thereof;
a third plate connected to said first plate and movable therewith in fixed spaced relationship on said base;
a locking mechanism between said second plate and said third plate for biasing said second and third plates in opposite directions when said first and second mold cavities are formed;
a distributor between and communicating with said first mold cavity and said second mold cavity;
a first injection cylinder on said distributor and feeding said first mold cavity therethrough;
a second injection cylinder on said distributor and feeding said second mold cavity therethrough; and
a feed screw barrel communicating through said distributor with said first injection cylinder and said second injection cylinder for the charging thereof with moldable material.
2. The device as defined in claim 1, further comprising rods rigidly connecting said first and third plates.
3. The device as defined in claim 1, further comprising:
a first hydraulic cylinder between said support means and said first plate for the displacement thereof; and
a second hydraulic cylinder between said support means and said second plate for the displacement thereof.
4. The device as defined in claim 1 wherein said locking mechanism comprises:
a first wedge member transversely displaceable on said third plate; and
a second wedge member axially displaceable by said first wedge member against said second plate.
5. The device as defined in claim 1 wherein said support means comprises:
a first stationary plate on said base and carrying said first stationary mold portion; and
a second stationary plate on said base and carrying said second mold portion, said distributor and said injection cylinders being between said first stationary plate and said second stationary plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/760,503 US4090837A (en) | 1977-01-19 | 1977-01-19 | Machine for molding materials with a long solidification time, such as structural foams |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/760,503 US4090837A (en) | 1977-01-19 | 1977-01-19 | Machine for molding materials with a long solidification time, such as structural foams |
Publications (1)
Publication Number | Publication Date |
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US4090837A true US4090837A (en) | 1978-05-23 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US05/760,503 Expired - Lifetime US4090837A (en) | 1977-01-19 | 1977-01-19 | Machine for molding materials with a long solidification time, such as structural foams |
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Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530655A (en) * | 1981-11-20 | 1985-07-23 | Karl Hehl | Mounting arrangement for die closing unit of injection molding machine |
US4668178A (en) * | 1984-12-28 | 1987-05-26 | Karl Hehl | Roller support for injection unit of injection molding machine |
US4749350A (en) * | 1986-10-31 | 1988-06-07 | Fritsch Rudolf P | Injection molding machine for plastic material |
US4753592A (en) * | 1984-08-04 | 1988-06-28 | Kaaden Hans Heinrich | Apparatus for producing plastic parts by injection molding or reaction injection molding |
US4968243A (en) * | 1989-08-01 | 1990-11-06 | Sorensen Jens Ole | Injection molding apparatus reducing counteractive deformation of desynchronously filled coaxially located molding cavities |
US5023039A (en) * | 1987-07-08 | 1991-06-11 | Primtec | Hold-pressure control in multi-parting injection molding system |
US5043129A (en) * | 1987-07-08 | 1991-08-27 | Primtec | Hold-pressure control and clamping in stacked multi-parting molding system having desynchronized injection periods |
US5055250A (en) * | 1988-01-29 | 1991-10-08 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5073328A (en) * | 1988-01-29 | 1991-12-17 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5112558A (en) * | 1988-01-29 | 1992-05-12 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5185119A (en) * | 1988-01-29 | 1993-02-09 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5200208A (en) * | 1988-08-11 | 1993-04-06 | Us Molding Machine Company | Multi-station rubber injection molding machine |
US5324192A (en) * | 1991-06-10 | 1994-06-28 | The Dow Chemical Company | Dual action molding press |
US5620723A (en) * | 1995-06-07 | 1997-04-15 | Husky Injection Molding Systems Ltd. | Injection molding machine |
US5624695A (en) * | 1995-06-07 | 1997-04-29 | Husky Injection Molding Systems Ltd. | Securing assembly for injection molding machines |
US5645875A (en) * | 1995-06-07 | 1997-07-08 | Husky Injection Molding Systems Ltd. | Securing/clamping assembly for injection molding machines |
US5772420A (en) * | 1996-12-16 | 1998-06-30 | Holmes; Henry T. | Greaseless mold carrier and alignment system |
US5997275A (en) * | 1996-07-11 | 1999-12-07 | Sarstedt Ag & Co. | Mold for making a part with lugs |
US6045740A (en) * | 1996-08-10 | 2000-04-04 | Guenther Heisskanaltechnik Gmbh | Process and device for manufacturing injection-molded parts from plastic material |
US6261085B1 (en) * | 1998-06-22 | 2001-07-17 | Reena Corporation | Tandem injection molding apparatus and press therefor |
US6425751B1 (en) | 1999-06-21 | 2002-07-30 | Besser Company | Apparatus for molding blocks |
ITUB20151122A1 (en) * | 2015-05-29 | 2016-11-29 | Krauss Maffei Tech Gmbh | APPARATUS FOR FOAMING REFRIGERATORS AND RELATED FOAMING METHOD |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US869828A (en) * | 1907-05-11 | 1907-10-29 | Charles J T Cordes | Building-block mold. |
US2292593A (en) * | 1939-02-11 | 1942-08-11 | Amigo Alfonso | Injection molding apparatus for synthetic materials |
US3015849A (en) * | 1959-06-08 | 1962-01-09 | Plymouth Die Mold Inc | Short-stroke press |
JPS436304Y1 (en) * | 1965-04-02 | 1968-03-21 | ||
US3647338A (en) * | 1969-09-15 | 1972-03-07 | Nippon Columbia | Disc record injection molding machine |
US3669601A (en) * | 1970-09-30 | 1972-06-13 | Bruno Lainesse | Apparatus for injection molding |
US3707342A (en) * | 1970-12-21 | 1972-12-26 | Mannesman Meer Ag | Injection molding apparatus for foamed plastics |
US3743469A (en) * | 1971-08-27 | 1973-07-03 | J Gibbons | Mold cavity locking apparatus |
US3880565A (en) * | 1974-04-22 | 1975-04-29 | Hoover Ball & Bearing Co | Twin clamp unit for blow molding machine |
-
1977
- 1977-01-19 US US05/760,503 patent/US4090837A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US869828A (en) * | 1907-05-11 | 1907-10-29 | Charles J T Cordes | Building-block mold. |
US2292593A (en) * | 1939-02-11 | 1942-08-11 | Amigo Alfonso | Injection molding apparatus for synthetic materials |
US3015849A (en) * | 1959-06-08 | 1962-01-09 | Plymouth Die Mold Inc | Short-stroke press |
JPS436304Y1 (en) * | 1965-04-02 | 1968-03-21 | ||
US3647338A (en) * | 1969-09-15 | 1972-03-07 | Nippon Columbia | Disc record injection molding machine |
US3669601A (en) * | 1970-09-30 | 1972-06-13 | Bruno Lainesse | Apparatus for injection molding |
US3707342A (en) * | 1970-12-21 | 1972-12-26 | Mannesman Meer Ag | Injection molding apparatus for foamed plastics |
US3743469A (en) * | 1971-08-27 | 1973-07-03 | J Gibbons | Mold cavity locking apparatus |
US3880565A (en) * | 1974-04-22 | 1975-04-29 | Hoover Ball & Bearing Co | Twin clamp unit for blow molding machine |
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530655A (en) * | 1981-11-20 | 1985-07-23 | Karl Hehl | Mounting arrangement for die closing unit of injection molding machine |
US4753592A (en) * | 1984-08-04 | 1988-06-28 | Kaaden Hans Heinrich | Apparatus for producing plastic parts by injection molding or reaction injection molding |
US4668178A (en) * | 1984-12-28 | 1987-05-26 | Karl Hehl | Roller support for injection unit of injection molding machine |
US4749350A (en) * | 1986-10-31 | 1988-06-07 | Fritsch Rudolf P | Injection molding machine for plastic material |
US5043129A (en) * | 1987-07-08 | 1991-08-27 | Primtec | Hold-pressure control and clamping in stacked multi-parting molding system having desynchronized injection periods |
US5023039A (en) * | 1987-07-08 | 1991-06-11 | Primtec | Hold-pressure control in multi-parting injection molding system |
US5055250A (en) * | 1988-01-29 | 1991-10-08 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5073328A (en) * | 1988-01-29 | 1991-12-17 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5112558A (en) * | 1988-01-29 | 1992-05-12 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5185119A (en) * | 1988-01-29 | 1993-02-09 | Husky Injection Molding Systems Ltd. | Injection molding process |
US5200208A (en) * | 1988-08-11 | 1993-04-06 | Us Molding Machine Company | Multi-station rubber injection molding machine |
US4968243A (en) * | 1989-08-01 | 1990-11-06 | Sorensen Jens Ole | Injection molding apparatus reducing counteractive deformation of desynchronously filled coaxially located molding cavities |
US5324192A (en) * | 1991-06-10 | 1994-06-28 | The Dow Chemical Company | Dual action molding press |
US5624695A (en) * | 1995-06-07 | 1997-04-29 | Husky Injection Molding Systems Ltd. | Securing assembly for injection molding machines |
US5645875A (en) * | 1995-06-07 | 1997-07-08 | Husky Injection Molding Systems Ltd. | Securing/clamping assembly for injection molding machines |
US5868989A (en) * | 1995-06-07 | 1999-02-09 | Husky Injection Molding Systems Ltd. | Method for clamping platens of injection molding machines |
US5928684A (en) * | 1995-06-07 | 1999-07-27 | Husky Injection Molding Systems Ltd. | Securing/clamping assembly for injection molding machines |
US5620723A (en) * | 1995-06-07 | 1997-04-15 | Husky Injection Molding Systems Ltd. | Injection molding machine |
US5997275A (en) * | 1996-07-11 | 1999-12-07 | Sarstedt Ag & Co. | Mold for making a part with lugs |
US6045740A (en) * | 1996-08-10 | 2000-04-04 | Guenther Heisskanaltechnik Gmbh | Process and device for manufacturing injection-molded parts from plastic material |
US5772420A (en) * | 1996-12-16 | 1998-06-30 | Holmes; Henry T. | Greaseless mold carrier and alignment system |
US6602456B2 (en) | 1998-06-22 | 2003-08-05 | Reena Corporation | Method and device for actuating a press |
US6261085B1 (en) * | 1998-06-22 | 2001-07-17 | Reena Corporation | Tandem injection molding apparatus and press therefor |
US6425751B1 (en) | 1999-06-21 | 2002-07-30 | Besser Company | Apparatus for molding blocks |
US20020125593A1 (en) * | 1999-06-21 | 2002-09-12 | Rene Bergeron | Apparatus and method for molding blocks |
US6814906B2 (en) | 1999-06-21 | 2004-11-09 | Besser Company | Apparatus and method for molding blocks |
ITUB20151122A1 (en) * | 2015-05-29 | 2016-11-29 | Krauss Maffei Tech Gmbh | APPARATUS FOR FOAMING REFRIGERATORS AND RELATED FOAMING METHOD |
WO2016192991A1 (en) * | 2015-05-29 | 2016-12-08 | Kraussmaffei Technologies Gmbh | Foaming apparatus for refrigerator cabinets and related foaming method |
KR20180011781A (en) * | 2015-05-29 | 2018-02-02 | 크라우스마파이 테크놀로지스 게엠베하 | Foaming devices for refrigerator cabinets and related foaming methods |
US11148329B2 (en) | 2015-05-29 | 2021-10-19 | Kraussmaffei Technologies Gmbh | Foaming apparatus for refrigerator cabinets and related foaming method |
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